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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcd44fc36b4b6af75e3a0d0f01716257f6c6d706b2d749da9551a7107098c32' 
  AND token = 'HaNg4Ja+l51xpysNkmniyk2wXAVO4rV8TSUlP//hQWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}